head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Competitive PvP
Arena fighting built on baiting substitutions and timing punishes against humans.

Execution · Competitive PvP
An arcade wrestling game testing grapple timing and reading opponent moves.
Naruto Shippuden: Ultimate Ninja Storm 3 leans Execution (Competitive PvP); WWF: Super Wrestlemania leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Naruto Shippuden: Ultimate Ninja Storm 3
Substitution timing and combo confirms need decent hands
WWF: Super Wrestlemania
Grapple and move timing drive matches
Naruto Shippuden: Ultimate Ninja Storm 3 leans a little harder on reads, though the gap is small.
Naruto Shippuden: Ultimate Ninja Storm 3
PvP revolves around baiting substitutions from human opponents
WWF: Super Wrestlemania
Human opponents allow reading grapple attempts
WWF: Super Wrestlemania leans a little harder on variance, though the gap is small.
Naruto Shippuden: Ultimate Ninja Storm 3
Support meter and item randomness barely matter
WWF: Super Wrestlemania
Some randomness in move success
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Naruto Shippuden: Ultimate Ninja Storm 3
Team composition and awakening knowledge add a thin layer
WWF: Super Wrestlemania
Move knowledge and stamina give modest edge
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.